CN102830855A - Optical multi-point touch screen controller with function of resisting condensation and control method - Google Patents
Optical multi-point touch screen controller with function of resisting condensation and control method Download PDFInfo
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Abstract
The invention discloses an optical multi-point touch screen controller with a function of resisting condensation and a control method, aiming at providing an optical multi-point touch screen controller with the function of resisting the condensation and a method for controlling an optical multi-point touch screen with the function of resisting the condensation. The controller comprises a sensor interface controlling unit, a lighting controlling unit, a glass heating controlling unit, a linear array data processing unit and an internal register. Through the control method, an optical calibrating work of the touch screen under an optical calibrating working mode is finished by the optical multi-point touch screen controller and a calibrating sheet is generated; meanwhile, under a normal working mode, the optical multi-point touch screen, through combining the calibrating sheet, can rapidly accurately respond to a multi-point touch operation of an optical touch screen in a severe damp environment where the condensation is easy to occur.
Description
Technical field
The present invention relates to touch screen controller and control method technical field, specifically a kind of optical profile type multiple point touching screen controller and control method with anti-freezing dew function.
Background technology
At present, touch-screen will replace traditional keyboard, mouse action by means of its convenience and intuitive gradually as a kind of man-machine interaction input equipment commonly used in the electronic product in some sector application.The optical profile type multi-point touch panel is as a kind of up-to-date human-computer interaction device; Resistive touch screen, capacitive touch screen, surface acoustic wave type touch-screen can be remedied and the deficiency that large scale touches the demonstration field can't be applied to; But present commercial optical profile type touching technique is under wet environment, because of optical component surface condensation can't normally use.
What most of touch screen controller technology were directed against is non-optical formula touch-screens such as sound wave type, resistance-type, condenser type; " adaptive frequency touchscreen controller and the method for utilizing adaptive frequency controller control touch-screen " such as Pinheiro contact system Co., Ltd's application; Application number is CN00820025.4, and this patent provides the method and apparatus of the acoustic touch screen controller that a kind of frequency of operation of adaptive character touch-screen requires; Application number such as ST-Ericsson Co., Ltd.'s application is CN200980153476.6 " touch screen controller " again; The application number of Qualcomm Inc's application is CN200980112115.7 " a low-power touch screen controller "; And the application CN200810210113.9 of Biyadi Co Ltd's application " resistive touch screen screen body, touch screen controller and method for identifying multiple touch points ", the touch screen controller that these three patents are described is the controller that is applicable to resistive touch screen.
Newer optical profile type touch screen controller technology can't solve the problem of touch-screen operate as normal under wet environment at present; Such as NextWindow company application " " application number is PCT/US2009/033624/200980108845.X to solve the system and method for multiple point touching sight of optical touch screen; The optical profile type touch-screen that this patent is described is under the environment of humidity; The lens surface of its imaging arrangement little water droplet of one deck that can congeal into; Can not form images and cause the touch-screen can't operate as normal, thereby not be suitable for the moist rugged surroundings that are prone to condensation; The application number of DUNG LAN-RON application is that " the Optical Touch Control Method and Apparatus Thereof " of US20090473183 and the application number of ACER INC application are JP2010007198 " Optical Touch Control System and Method Thereof " for another example, and the method for toch control that these patents are described can not solve the problem of optical profile type touch-screen condensation cisco unity malfunction under wet environment.
Summary of the invention
The object of the present invention is to provide a kind of optical profile type multiple point touching screen controller and control method that function is revealed in anti-freezing that have; The also accurately multiple point touching operation of response optical profile type touch-screen fast; Prevent optical component under wet environment because of condensation lost efficacy, thereby realize that touch-screen is prone in humidity work under the rugged surroundings of condensation.
The present invention provides a kind of optical profile type multiple point touching controller that function is revealed in anti-freezing that has, and this controller comprises sensor interface control module 10, the control module 20 of lighting a lamp, glass heats control module 30, linear array images data processing unit 40, internal register 50.
Sensor interface control module 10 is through line scan image sensor, relative humidity sensor and the required control signal of peripheral circuit work thereof in the interface circuit transmission optics formula multi-point touch panel mask; Receive the difference string column rule system of battle formations as data and serial relative humidity data, and the difference string column rule system of battle formations is carried out the conversion process that differential data changes single-ended data as data.The associated lamp chain of infrared LED lamp bar of the light source as a setting installed on 20 pairs of optical profile type multi-point touch panels of control module mask of lighting a lamp carries out switch control.30 pairs of relative humidity data of glass heats control module are carried out serial data and are changeed the parallel data processing; The humidity threshold value that more current relative humidity data and internal register 50 are set; But judge whether and to carry out electrical heating to heating glass; Glass heats control module 30 generates relative humidity sensor and required serial samples clock signal and the chip selection signal of serial AD C work thereof simultaneously, and is transferred to the relative humidity sensor peripheral circuit in the optical profile type multi-point touch panel mask through the interface circuit of sensor interface control module 10.Linear array images data processing unit 40 is provided with according to the parameter of optics staking-out work pattern the linear array images data is handled when optics staking-out work pattern, sends the nominal data that obtains to main frame, and the calibration scale that generates of download host; Linear array images data processing unit 40 is when normal mode of operation; Be provided with according to the parameter of normal mode of operation the linear array images data are handled; Result is correlated with according to calibration scale resolves; Thereby obtain the screen geometry coordinate of optical profile type multi-point touch panel, and send back to main frame, thereby the touch of accomplishing the optical profile type multi-point touch panel is controlled with the form of packet.Internal register 50 is provided with the exposure time values under humidity threshold value, optics demarcation and two kinds of mode of operations of operate as normal.
Described sensor interface control module 10 comprises: interface connector 11 and spi bus controller 12.Line scan image sensor and operational amplifier thereof, serial AD C and spi bus controller are welded on the drive plate in the optical profile type multi-point touch panel mask; But relative humidity sensor is mounted on the trapezoidal imaging box outside near electrically heated glass sheet place; And be connected with drive plate through cable, the operational amplifier of relative humidity sensor and serial AD C are welded on the drive plate.Be connected with drive plate through interface connector 11 with touch screen controller of the present invention.Interface connector 11 sends the required various signals of drive plate work to drive plate, comprises the required control clock signal Φ M of line scan image sensor work, integration reset signal ICG, electronic shutter signal SH; The required chip selection signal CS_ of serial AD C work of line scan image sensor; The required serial samples clock signal SCLK_H and the chip selection signal CS_H of serial AD C work of relative humidity sensor; Required difference serial sampled clock signal SCLK+, the SCLK-of spi bus controller work in the mask.Interface connector 11 receives the difference string column rule system of battle formations of drive plate output as data SDA+, SDA-and relative humidity data SDA_H.Spi bus controller 12 comprises receiver Receiver and driver Driver.Receiver Receiver receives the difference string column rule system of battle formations as data SDA+, SDA-; And convert thereof into serial linear array images data SDA; Driver Driver receives serial samples clock signal SCLK, and converts thereof into difference serial sampled clock signal SCLK+, SCLK-.
The described control module 20 of lighting a lamp comprises: the signal generator 21 of lighting a lamp, LED-backlit driver 22 and calibration switch 23.The signal generator 21 of lighting a lamp generates the control signal CtrSig that lights a lamp according to the control clock signal Φ M of line scan image sensor, integration reset signal ICG, electronic shutter signal SH.As shown in Figure 6, only in the time shutter of line scan image sensor, the control signal of lighting a lamp CtrSig is just effective, so only in the time shutter of line scan image sensor, lights the associated lamp chain on the infrared LED lamp bar, can reduce the power consumption of background light source.LED-backlit driver 22 has three kinds of mode of operations, comprises principal and subordinate's mode of operation, I2C bus operation mode and manual work pattern.In the controller of the present invention, the frequency of operation of LED-backlit driver 22 is 2 times of control clock signal Φ M of touch-screen line scan image sensor, is a fixed frequency, so adopt the simplest manual work pattern of circuit.Can drive I0～I9 160 LED lamps of totally 10 passages when LED-backlit driver 22 is operated at full capacity, its design (calculated) load ability decides according to the size of optical profile type multi-point touch panel.LED-backlit driver 22 is according to the some modulating signal VOUT and the I0～I9 of the control signal CtrSig output mask lamp bar of lighting a lamp.The optical profile type multi-point touch panel is when optics staking-out work pattern, and calibration switch 23 only carries out switch control to the associated lamp chain of the infrared LED lamp bar of the light source as a setting installed on the optical touch screen mask under this pattern.In addition; When normal mode of operation, the size of optical profile type multi-point touch panel is different, and infrared LED quantity is also different on the infrared LED lamp bar quantity of required light source as a setting and the lamp chain; In controller of the present invention; LED-backlit driver 22 is the circuit design when operating at full capacity state, and through calibration switch 23 being carried out break-make control, controller of the present invention then can realize being applicable to the optical profile type multi-point touch panel of different size.The mode of lamp bar through cable of lighting a lamp in control module 20 and the optical profile type multi-point touch panel mask is connected.
Described glass heats control module 30 comprises: humidity data digital dock manager 31, humidity data string change also processor 32, humidity comparer 33 and scalable constant-current source driver 34.Controller of the present invention is gathered the relative humidity data at set intervals one time; But and obtain the current relative humidity data of the trapezoidal imaging box outside near electrically heated glass sheet place in view of the above, so humidity data digital dock manager 31 utilizes the serial AD C of control clock signal Φ M generation relative humidity sensor of global clock signal GCLK and the line scan image sensor of controller work required serial samples clock signal SCLK_H and chip selection signal CS_H among the present invention.The humidity data string changes and processor 32 receives serial relative humidity data SDA_H, and carries out the processing that serial data is changeed parallel data, and the humidity threshold value that parallel relative humidity data PDA_H and internal register 50 are provided with compares in humidity comparer 33.Like Fig. 7; Fig. 7 is that optical profile type multi-point touch panel mask manhole ladder forms the structural representation as box; But the electrically heated glass sheet is mounted on the outside of trapezoidal box like structure top margin; But infrared fileter is installed between electrically heated glass sheet and the projection face lens, but relative humidity sensor just is mounted on imaging with approaching electrically heated glass sheet place, the trapezoidal box like structure upper plate outside, trapezoidal imaging box good seal.So; When the relative humidity data value is higher than the humidity threshold value, but have only the outside surface of electrically heated glass that the danger of condensation is arranged, then humidity comparer 33 sends electrical heating control signal PWM; But the electrically heated glass sheet is carried out electrical heating, be lower than the humidity threshold value until the relative humidity data value.Scalable LED constant-current source driver 34 receives electrical heating control signal PWM; Output electrical heating signal Q and REF; But electrical heating signal Q is connected through the mode of cable and the bonding jumper at electrically heated glass sheet two ends with the REF signal; Thereby accomplish electrical heating control, realize that function is revealed in the anti-freezing of controller of the present invention and control method.
Described linear array images data processing unit 40 comprises: linear array images data digital timer manager 41, linear array images serial data change also processor 42, linear array images data counter 43, linear array images data parsing processor 44 and calibration scale storer 45.Linear array images data digital timer manager 41 utilizes the global clock signal GCLK of controller of the present invention to generate the required serial samples clock signal SCLK of serial AD C work of required control clock signal Φ M of line scan image sensor work and line scan image sensor.The linear array images serial data changes and processor 42 receives serial linear array images data SDA, and carries out the processing that serial data is changeed parallel data.Linear array images data counter 43 is according to the exposure time values and the control clock signal Φ M of host setting; Generate required integration reset signal ICG, the electronic shutter signal SH of line scan image sensor work, generate the required chip selection signal CS_ of serial AD C work of line scan image sensor simultaneously.Linear array images data counter 43 is that unit counts parallel linear array images data PDA with the frame, whenever writes a frame all over, then this main feed line system of battle formations is sent to linear array images data parsing processor 44 as data PDAs.The optical profile type multi-point touch panel that controller of the present invention is controlled, 70% the when exposure time values when optics staking-out work pattern is normal mode of operation.For different exposure time values, the sequential control method of linear array images data counter 43 is identical.Under optics staking-out work pattern; 44 pairs of linear array images data of linear array images data parsing processor carry out dissection process and the network interface through controller of the present invention sends to main frame; The relevant calibrating procedure of main frame operation is handled the calibration scale that needs when generating this optical profile type multi-point touch panel normal mode of operation to the linear array images data, and calibration scale is downloaded to calibration scale storer 45.Under normal mode of operation; Linear array images data parsing processor 44 is handled as data parsing each main feed line system of battle formations; Result is correlated with according to the calibration scale in the calibration scale storer 45 resolves, the linear array images data reduction is become the blackening position, and convert the screen geometry coordinate to.USB mouth through controller of the present invention sends to main frame with screen geometry coordinate data bag, parses corresponding pixel coordinate in view of the above by main frame, thereby accomplishes touch operation.
The present invention provides a kind of optical profile type multi-point touch panel control method that function is revealed in anti-freezing that has, and this control method comprises two steps:
(1) internal register 50 through controller is set at the exposure time values under the calibration mode with exposure time values, generates required required chip selection signal CS_, the serial samples clock signal SCLK of control clock signal Φ M, integration reset signal ICG, electronic shutter signal SH and the work of linear array images data serial analog to digital converter of line scan image sensor work;
(2) controller generates the control signal of lighting a lamp according to the control clock signal Φ M of line scan image sensor, electronic shutter signal SH and integration reset signal ICG, and the associated lamp chain of the infrared LED lamp bar of the light source as a setting installed on the optical touch screen mask is carried out switch control;
(3) controller through interface circuit receive the serial differential linear array images data SDA of line scan image sensor after conversion ±, serial differential linear array images data SDA ± carry out differential data is changeed single-ended data processing changes the parallel data processing with serial data;
(4) controller is handled through parallel linear array images data and is generated the nominal data bag; And be transferred to main frame; The calibration scale that the calibrating procedure that the main frame operation is relevant needs when handling with the generation normal mode of operation to the linear array images data; Then calibration scale is downloaded in the controller, thus the optics staking-out work of completion optical profile type multi-point touch panel;
Step 2 is an optical profile type multi-point touch panel operate as normal, and the optical profile type multi-point touch panel control method with anti-freezing dew function under the normal mode of operation comprises the steps:
(1) internal register 50 through controller is set at the exposure time values under the normal mode of operation with exposure time values; Generate required required chip selection signal CS_, the serial samples clock signal SCLK of control clock signal Φ M, integration reset signal ICG, electronic shutter signal SH and the work of linear array images data serial analog to digital converter of line scan image sensor work, and generate required chip selection signal CS_H and the serial samples clock signal SCLK_H of relative humidity sensor serial analog to digital converter work according to the control clock signal Φ M of line scan image sensor;
(2) controller generates the control signal of lighting a lamp according to control clock signal Φ M, electronic shutter signal SH and the integration reset signal ICG of line scan image sensor; And the associated lamp chain of the infrared LED lamp bar of the light source as a setting installed on the optical touch screen mask carried out switch control, only in the time shutter of the line scan image sensor of electronic shutter signal decision, light the associated lamp chain on the infrared LED lamp bar;
(3) controller through interface circuit receive the serial differential linear array images data SDA of line scan image sensor after conversion ± with the serial relative humidity data SDA_H of relative humidity sensor; To serial differential linear array images data SDA ± carrying out differential data changes single-ended data processing and the processing of serial data commentaries on classics parallel data, the single-ended relative humidity data of serial SDA_H is carried out serial data change the parallel data processing;
(4) internal register through controller is provided with the humidity threshold value; And compare with current relative humidity data; When the relative humidity data greater than the humidity threshold value, but then export effective electrical heating signal PWM heating glass is carried out electrical heating, be lower than the humidity threshold value until the relative humidity data;
(5) controller carries out Flame Image Process to parallel linear array images data; Result is correlated with according to calibration scale resolves; Thereby obtain the screen geometry coordinate of optical profile type multi-point touch panel, and send back to main frame, thereby the touch of accomplishing the optical profile type multi-point touch panel is controlled with the form of packet.
When the present invention has advantage that anti-freezing reveals optical profile type multiple point touching screen controller and the control method of function and is the multiple point touching operation of fast and accurately response optical profile type touch-screen, realize that touch-screen is prone in humidity work under the rugged surroundings of condensation.
Description of drawings
Fig. 1 is a controller general structure block diagram of the present invention;
Fig. 2 is a sensor interface control module structured flowchart of the present invention;
Fig. 3 is the control module structured flowchart of lighting a lamp of the present invention;
Fig. 4 is a glass heats control module structured flowchart of the present invention;
Fig. 5 is a linear array images data processing unit structured flowchart of the present invention;
Fig. 6 is the control signal sequential chart of lighting a lamp of the present invention;
Fig. 7 is the structural representation of the trapezoidal imaging box of imaging in the optical profile type multi-point touch panel mask.
Embodiment
Further specify technical scheme of the present invention below in conjunction with accompanying drawing.
Fig. 1 is a controller general structure block diagram of the present invention.Like Fig. 1, a kind of optical profile type multiple point touching screen controller with anti-freezing dew function of the present invention comprises: sensor interface control module 10, the control module 20 of lighting a lamp, glass heats control module 30, linear array images data processing unit 40 and internal register 50.
Sensor interface control module 10 is through line scan image sensor, relative humidity sensor and the required control signal of peripheral circuit work thereof in the interface circuit transmission optics formula multi-point touch panel mask; Receive the difference string column rule system of battle formations as data and serial relative humidity data, and the difference string column rule system of battle formations is carried out the conversion process that differential data changes single-ended data as data.The associated lamp chain of infrared LED lamp bar of the light source as a setting installed on 20 pairs of optical profile type multi-point touch panels of control module mask of lighting a lamp carries out switch control.30 pairs of relative humidity data of glass heats control module are carried out serial data and are changeed the parallel data processing; The humidity threshold value that more current relative humidity data and internal register 50 are set; But judge whether and to carry out electrical heating to heating glass; Glass heats control module 30 generates relative humidity sensor and required serial samples clock signal and the chip selection signal of serial AD C work thereof simultaneously, and is transferred to the relative humidity sensor peripheral circuit in the optical profile type multi-point touch panel mask through the interface circuit of sensor interface control module 10.Linear array images data processing unit 40 is provided with according to the parameter of optics staking-out work pattern the linear array images data is handled when optics staking-out work pattern, sends the nominal data that obtains to main frame, and the calibration scale that generates of download host; Linear array images data processing unit 40 is when normal mode of operation; Be provided with according to the parameter of normal mode of operation the linear array images data are handled; Result is correlated with according to calibration scale resolves; Thereby obtain the screen geometry coordinate of optical profile type multi-point touch panel, and send back to main frame, thereby the touch of accomplishing the optical profile type multi-point touch panel is controlled with the form of packet.Internal register 50 is provided with the exposure time values under humidity threshold value, optics demarcation and two kinds of mode of operations of operate as normal.
Fig. 1 has also explained a kind of optical profile type multi-point touch panel control method under the optics staking-out work pattern provided by the invention, and this mode of operation is only used before the optical profile type multi-point touch panel dispatches from the factory once to confirm its relative photo mathematic(al) parameter, comprises the steps:
(1) internal register 50 through controller is set at the exposure time values under the calibration mode with exposure time values, generates required required chip selection signal CS_, the serial samples clock signal SCLK of control clock signal Φ M, integration reset signal ICG, electronic shutter signal SH and the work of linear array images data serial analog to digital converter of line scan image sensor work;
(2) controller generates the control signal of lighting a lamp according to the control clock signal Φ M of line scan image sensor, electronic shutter signal SH and integration reset signal ICG, and the associated lamp chain of the infrared LED lamp bar of the light source as a setting installed on the optical touch screen mask is carried out switch control;
(3) controller through interface circuit receive the serial differential linear array images data SDA of line scan image sensor after conversion ±, serial differential linear array images data SDA ± carry out differential data is changeed single-ended data processing changes the parallel data processing with serial data;
(4) controller is handled through parallel linear array images data and is generated the nominal data bag; And be transferred to main frame; The calibration scale that the calibrating procedure that the main frame operation is relevant needs when handling with the generation normal mode of operation to the linear array images data; Then calibration scale is downloaded in the controller, thus the optics staking-out work of completion optical profile type multi-point touch panel.
Fig. 1 has also explained a kind of optical profile type multi-point touch panel control method with anti-freezing dew function under the normal mode of operation provided by the invention simultaneously, comprises the steps:
(1) internal register 50 through controller is set at the exposure time values under the normal mode of operation with exposure time values; Generate required required chip selection signal CS_, the serial samples clock signal SCLK of control clock signal Φ M, integration reset signal ICG, electronic shutter signal SH and the work of linear array images data serial analog to digital converter of line scan image sensor work, and generate required chip selection signal CS_H and the serial samples clock signal SCLK_H of relative humidity sensor serial analog to digital converter work according to the control clock signal Φ M of line scan image sensor;
(2) controller generates the control signal of lighting a lamp according to control clock signal Φ M, electronic shutter signal SH and the integration reset signal ICG of line scan image sensor; And the associated lamp chain of the infrared LED lamp bar of the light source as a setting installed on the optical touch screen mask carried out switch control, only in the time shutter of the line scan image sensor of electronic shutter signal decision, light the associated lamp chain on the infrared LED lamp bar;
(3) controller through interface circuit receive the serial differential linear array images data SDA of line scan image sensor after conversion ± with the serial relative humidity data SDA_H of relative humidity sensor; To serial differential linear array images data SDA ± carrying out differential data changes single-ended data processing and the processing of serial data commentaries on classics parallel data, the single-ended relative humidity data of serial SDA_H is carried out serial data change the parallel data processing;
(4) internal register through controller is provided with the humidity threshold value; And compare with current relative humidity data; When the relative humidity data greater than the humidity threshold value, but then export effective electrical heating signal PWM heating glass is carried out electrical heating, be lower than the humidity threshold value until the relative humidity data;
(5) controller carries out Flame Image Process to parallel linear array images data; Result is correlated with according to calibration scale resolves; Thereby obtain the screen geometry coordinate of optical profile type multi-point touch panel, and send back to main frame, thereby the touch of accomplishing the optical profile type multi-point touch panel is controlled with the form of packet.
Fig. 2 is a sensor interface control module structured flowchart of the present invention.Like Fig. 2, sensor interface control module 10 is made up of interface connector 11 and spi bus controller 12.Line scan image sensor and operational amplifier thereof, serial AD C and spi bus controller are welded on the drive plate in the optical profile type multi-point touch panel mask; But relative humidity sensor is mounted on the trapezoidal imaging box outside near electrically heated glass sheet place; And be connected with drive plate through cable, the operational amplifier of relative humidity sensor and serial AD C are welded on the drive plate.Be connected with drive plate through interface connector 11 with touch screen controller of the present invention.Interface connector 11 sends the required various signals of drive plate work to drive plate, comprises the required control clock signal Φ M of line scan image sensor work, integration reset signal ICG, electronic shutter signal SH; The required chip selection signal CS_ of serial AD C work of line scan image sensor; The required serial samples clock signal SCLK_H and the chip selection signal CS_H of serial AD C work of relative humidity sensor; Required difference serial sampled clock signal SCLK+, the SCLK-of spi bus controller work in the mask.Interface connector 11 receives the difference string column rule system of battle formations of drive plate output as data SDA+, SDA-and relative humidity data SDA_H.Spi bus controller 12 comprises receiver Receiver and driver Driver.Receiver Receiver receives the difference string column rule system of battle formations as data SDA+, SDA-; And convert thereof into serial linear array images data SDA; Driver Driver receives serial samples clock signal SCLK, and converts thereof into difference serial sampled clock signal SCLK+, SCLK-.
Fig. 3 is the control module structured flowchart of lighting a lamp of the present invention.Like Fig. 3, the control module 20 of lighting a lamp is made up of the signal generator 21 of lighting a lamp, LED-backlit driver 22 and calibration switch 23.The signal generator 21 of lighting a lamp generates the control signal CtrSig that lights a lamp according to the control clock signal Φ M of line scan image sensor, integration reset signal ICG, electronic shutter signal SH.As shown in Figure 6, only in the time shutter of line scan image sensor, the control signal of lighting a lamp CtrSig is just effective, so only in the time shutter of line scan image sensor, lights the associated lamp chain on the infrared LED lamp bar, can reduce the power consumption of background light source.LED-backlit driver 22 has three kinds of mode of operations, comprises principal and subordinate's mode of operation, I2C bus operation mode and manual work pattern.In the controller of the present invention, the frequency of operation of LED-backlit driver 22 is 2 times of control clock signal Φ M of touch-screen line scan image sensor, is a fixed frequency, so adopt the simplest manual work pattern of circuit.Can drive I0～I9 160 LED lamps of totally 10 passages when LED-backlit driver 22 is operated at full capacity, its design (calculated) load ability decides according to the size of optical profile type multi-point touch panel.LED-backlit driver 22 is according to the some modulating signal VOUT and the I0～I9 of the control signal CtrSig output mask lamp bar of lighting a lamp.The optical profile type multi-point touch panel is when optics staking-out work pattern, and calibration switch 23 only carries out switch control to the associated lamp chain of the infrared LED lamp bar of the light source as a setting installed on the optical touch screen mask under this pattern.In addition; When normal mode of operation, the size of optical profile type multi-point touch panel is different, and infrared LED quantity is also different on the infrared LED lamp bar quantity of required light source as a setting and the lamp chain; In controller of the present invention; LED-backlit driver 22 is the circuit design when operating at full capacity state, and through calibration switch 23 being carried out break-make control, controller of the present invention then can realize being applicable to the optical profile type multi-point touch panel of different size.The mode of lamp bar through cable of lighting a lamp in control module 20 and the optical profile type multi-point touch panel mask is connected.
Fig. 4 is a glass heats control module structured flowchart of the present invention.Like Fig. 4, glass heats control module 30 is made up of humidity data digital dock manager 31, the commentaries on classics of humidity data string and processor 32, humidity comparer 33 and scalable constant-current source driver 34.Controller of the present invention is gathered the relative humidity data at set intervals one time; But and obtain the current relative humidity data of the trapezoidal imaging box outside near electrically heated glass sheet place in view of the above, so humidity data digital dock manager 31 utilizes the serial AD C of control clock signal Φ M generation relative humidity sensor of global clock signal GCLK and the line scan image sensor of controller work required serial samples clock signal SCLK_H and chip selection signal CS_H among the present invention.The humidity data string changes and processor 32 receives serial relative humidity data SDA_H, and carries out the processing that serial data is changeed parallel data, and the humidity threshold value that parallel relative humidity data PDA_H and internal register 50 are provided with compares in humidity comparer 33.Like Fig. 7; Fig. 7 is that optical profile type multi-point touch panel mask manhole ladder forms the structural representation as box; But the electrically heated glass sheet is mounted on the outside of trapezoidal box like structure top margin; But infrared fileter is installed between electrically heated glass sheet and the projection face lens, but relative humidity sensor just is mounted on imaging with approaching electrically heated glass sheet place, the trapezoidal box like structure upper plate outside, trapezoidal imaging box good seal.So; When the relative humidity data value is higher than the humidity threshold value, but have only the outside surface of electrically heated glass that the danger of condensation is arranged, then humidity comparer 33 sends electrical heating control signal PWM; But the electrically heated glass sheet is carried out electrical heating, be lower than the humidity threshold value until the relative humidity data value.Scalable LED constant-current source driver 34 receives electrical heating control signal PWM; Output electrical heating signal Q and REF; But electrical heating signal Q is connected through the mode of cable and the bonding jumper at electrically heated glass sheet two ends with the REF signal; Thereby accomplish electrical heating control, realize that function is revealed in the anti-freezing of controller of the present invention and control method.
Fig. 5 is a linear array images data processing unit structured flowchart of the present invention.Like Fig. 5, linear array images data processing unit 40 is made up of linear array images data digital timer manager 41, the commentaries on classics of linear array images serial data and processor 42, linear array images data counter 43, linear array images data parsing processor 44 and calibration scale storer 45.Linear array images data digital timer manager 41 utilizes the global clock signal GCLK of controller of the present invention to generate the required serial samples clock signal SCLK of serial AD C work of required control clock signal Φ M of line scan image sensor work and line scan image sensor.The linear array images serial data changes and processor 42 receives serial linear array images data SDA, and carries out the processing that serial data is changeed parallel data.Linear array images data counter 43 is according to the exposure time values and the control clock signal Φ M of host setting; Generate required integration reset signal ICG, the electronic shutter signal SH of line scan image sensor work, generate the required chip selection signal CS_ of serial AD C work of line scan image sensor simultaneously.Linear array images data counter 43 is that unit counts parallel linear array images data PDA with the frame, whenever writes a frame all over, then this main feed line system of battle formations is sent to linear array images data parsing processor 44 as data PDAs.The optical profile type multi-point touch panel that controller of the present invention is controlled, 70% the when exposure time values when optics staking-out work pattern is normal mode of operation.For different exposure time values, the sequential control method of linear array images data counter 43 is identical.Under optics staking-out work pattern; 44 pairs of linear array images data of linear array images data parsing processor carry out dissection process and the network interface through controller of the present invention sends to main frame; The relevant calibrating procedure of main frame operation is handled the calibration scale that needs when generating this optical profile type multi-point touch panel normal mode of operation to the linear array images data, and calibration scale is downloaded to calibration scale storer 45.Under normal mode of operation; Linear array images data parsing processor 44 is handled as data parsing each main feed line system of battle formations; Result is correlated with according to the calibration scale in the calibration scale storer 45 resolves, the linear array images data reduction is become the blackening position, and convert the screen geometry coordinate to.USB mouth through controller of the present invention sends to main frame with screen geometry coordinate data bag, parses corresponding pixel coordinate in view of the above by main frame, thereby accomplishes touch operation.
Claims (3)
1. one kind has the optical profile type multiple point touching screen controller that function is revealed in anti-freezing, it is characterized in that this controller comprises sensor interface control module (10), the control module of lighting a lamp (20), glass heats control module (30), linear array images data processing unit (40), internal register (50);
(1) described sensor interface control module (10) is through line scan image sensor, relative humidity sensor and the required control signal of peripheral circuit work thereof in the interface circuit transmission optics formula multi-point touch panel mask; Receive the difference string column rule system of battle formations as data and serial relative humidity data, and the difference string column rule system of battle formations is carried out the conversion process that differential serial data is changeed serial data as data;
(2) the described control module of lighting a lamp (20) carries out switch control to the associated lamp chain of the infrared LED lamp bar of the light source as a setting installed on the optical profile type multi-point touch panel mask, can reduce the power consumption of background light source;
(3) described glass heats control module (30) carries out serial data to the relative humidity data and changes the parallel data processing, but whether electrically heated glass is needed electrical heating judgement and electrical heating control;
(4) described linear array images data processing unit (40) sends the linear array images data packet to main frame under calibration mode, and the calibration scale that returns of storage host; Under normal mode of operation,, the linear array images data are carried out dissection process, generate the screen geometry coordinate of multi-point touch panel, send back to main frame with the form of packet according to calibration scale;
(5) described internal register (50) is provided with the exposure time values under humidity threshold value, optics demarcation and two kinds of mode of operations of operate as normal.
2. one kind has the optical profile type multi-point touch panel control method that function is revealed in anti-freezing, it is characterized in that comprising the steps:
Step 1 is the optics staking-out work, and only use is once to confirm its relative photo mathematic(al) parameter before the optical profile type multi-point touch panel dispatches from the factory in the optics staking-out work, and the optical profile type multi-point touch panel control method under the optics staking-out work pattern comprises the steps:
(1) internal register (50) through controller is set at the exposure time values under the calibration mode with exposure time values, generates required required chip selection signal CS_, the serial samples clock signal SCLK of control clock signal Φ M, integration reset signal ICG, electronic shutter signal SH and the work of linear array images data serial analog to digital converter of line scan image sensor work;
(2) controller generates the control signal of lighting a lamp according to the control clock signal Φ M of line scan image sensor, electronic shutter signal SH and integration reset signal ICG, and the associated lamp chain of the infrared LED lamp bar of the light source as a setting installed on the optical touch screen mask is carried out switch control;
(3) controller through interface circuit receive the serial differential linear array images data SDA of line scan image sensor after conversion ±, serial differential linear array images data SDA ± carry out differential data is changeed single-ended data processing changes the parallel data processing with serial data;
(4) controller is handled through parallel linear array images data and is generated the nominal data bag; And be transferred to main frame; The calibration scale that the calibrating procedure that the main frame operation is relevant needs when handling with the generation normal mode of operation to the linear array images data; Then calibration scale is downloaded in the controller, thus the optics staking-out work of completion optical profile type multi-point touch panel;
Step 2 is an optical profile type multi-point touch panel operate as normal, and the optical profile type multi-point touch panel control method with anti-freezing dew function under the normal mode of operation comprises the steps:
(1) internal register (50) through controller is set at the exposure time values under the normal mode of operation with exposure time values; Generate required required chip selection signal CS_, the serial samples clock signal SCLK of control clock signal Φ M, integration reset signal ICG, electronic shutter signal SH and the work of linear array images data serial analog to digital converter of line scan image sensor work, and generate required chip selection signal CS_H and the serial samples clock signal SCLK_H of relative humidity sensor serial analog to digital converter work according to the control clock signal Φ M of line scan image sensor;
(2) controller generates the control signal of lighting a lamp according to control clock signal Φ M, electronic shutter signal SH and the integration reset signal ICG of line scan image sensor; And the associated lamp chain of the infrared LED lamp bar of the light source as a setting installed on the optical touch screen mask carried out switch control, only in the time shutter of the line scan image sensor of electronic shutter signal decision, light the associated lamp chain on the infrared LED lamp bar;
(3) controller through interface circuit receive the serial differential linear array images data SDA of line scan image sensor after conversion ± with the serial relative humidity data SDA_H of relative humidity sensor; To serial differential linear array images data SDA ± carrying out differential data changes single-ended data processing and the processing of serial data commentaries on classics parallel data, the single-ended relative humidity data of serial SDA_H is carried out serial data change the parallel data processing;
(4) internal register through controller is provided with the humidity threshold value; And compare with current relative humidity data; When the relative humidity data greater than the humidity threshold value, but then export effective electrical heating signal PWM heating glass is carried out electrical heating, be lower than the humidity threshold value until the relative humidity data;
(5) controller carries out Flame Image Process to parallel linear array images data; Result is correlated with according to calibration scale resolves; Thereby obtain the screen geometry coordinate of optical profile type multi-point touch panel, and send back to main frame, thereby the touch of accomplishing the optical profile type multi-point touch panel is controlled with the form of packet.
3. a kind of optical profile type multiple point touching screen controller that function is revealed in anti-freezing that has according to claim 1; It is characterized in that: the said control module of lighting a lamp (20) is made up of the signal generator of lighting a lamp (21), LED-backlit driver (22) and calibration switch (23)
(1) signal generator (21) of lighting a lamp generates the control signal CtrSig that lights a lamp according to the control clock signal Φ M of line scan image sensor, integration reset signal ICG, electronic shutter signal SH;
(2) LED-backlit driver (22) is according to the some modulating signal VOUT and the I0～I9 of the control signal CtrSig output mask lamp bar of lighting a lamp;
(3) calibration switch (23) only carries out switch control to the associated lamp chain of the infrared LED lamp bar of the light source as a setting installed on the optical touch screen mask under the work at present pattern.
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| CN104238621A (en) * | 2014-09-12 | 2014-12-24 | 广州文冲船厂有限责任公司 | Constant power control method and control system for heating glass of cab |
| CN107356283A (en) * | 2017-07-27 | 2017-11-17 | 上海三菱电梯有限公司 | The environment weatherability intensifier of optics sensor |
| CN111949120A (en) * | 2019-05-16 | 2020-11-17 | 思睿逻辑国际半导体有限公司 | Interference detection and mitigation in inductive sensor applications and dynamic adaptation based on real-time noise detection |
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| CN104238621A (en) * | 2014-09-12 | 2014-12-24 | 广州文冲船厂有限责任公司 | Constant power control method and control system for heating glass of cab |
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